GPI Spectra of HR8799 C, D, and E in H-K Bands with KLIP Forward Modeling

Greenbaum, Alexandra Z ; Pueyo, Laurent ; Ruffio, Jean-Baptiste ; Wang, Jason J ; De Rosa, Robert J ; Aguilar, Jonathan ; Rameau, Julien ; Barman, Travis ; Marois, Christian ; Marley, Mark S(NASA Ames Research Center, Moffett Field, CA, United States)

关键词: ATMOSPHERIC MODELS;    CORONAGRAPHS;    DWARF STARS;    NATURAL SATELLITES;    SPECTROPHOTOMETRY;    MICROGRAVITY;    PLANETS;    SPECTRA;    SPHERES;   

RP-ID  :  ARC-E-DAA-TN52375

学科分类：天文学(综合)

美国|英语

来源: NASA Technical Reports Server

【 摘 要 】

We demonstrate KLIP forward modeling spectral extraction on Gemini Planet Imager coronagraphic data of HR8799, using PyKLIP. We report new and re-reduced spectrophotometry of HR8799 c, d, and e from H-K bands. We discuss a strategy for choosing optimal KLIP PSF subtraction parameters by injecting fake sources and recovering them over a range of parameters. The K1/K2 spectra for planets c and d are similar to previously published results from the same dataset. We also present a K band spectrum of HR8799e for the first time and show that our H-band spectra agree well with previously published spectra from the VLT/SPHERE instrument. We compare planets c, d, and e with M, L, and T-type field objects. All objects are consistent with low gravity mid-to-late L dwarfs, however, a lack of standard spectra for low gravity late L-type objects lead to poor fit for gravity. We place our results in context of atmospheric models presented in previous publications and discuss differences in the spectra of the three planets.